[Link] https://www.acmicpc.net/problem/17404
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import java.util.*;
import java.io.*;
public class Main {
static BufferedReader br;
static StringBuilder sb = new StringBuilder();
public static void main(String[] args) throws IOException {
br = new BufferedReader(new InputStreamReader(System.in));
int n = toi(br.readLine());
int[] arr;
int[][] dp0 = new int[n + 1][3];
int[][] dp1 = new int[n + 1][3];
int[][] dp2 = new int[n + 1][3];
for(int[] ar: dp0) Arrays.fill(ar, 55555555);
for(int[] ar: dp1) Arrays.fill(ar, 55555555);
for(int[] ar: dp2) Arrays.fill(ar, 55555555);
arr = getArr();
dp0[1][0] = arr[0];
dp1[1][1] = arr[1];
dp2[1][2] = arr[2];
for(int i = 2; i < n; i++) {
arr = getArr();
dp0[i][0] = Math.min(dp0[i-1][1], dp0[i-1][2]) + arr[0];
dp0[i][1] = Math.min(dp0[i-1][0], dp0[i-1][2]) + arr[1];
dp0[i][2] = Math.min(dp0[i-1][0], dp0[i-1][1]) + arr[2];
dp1[i][0] = Math.min(dp1[i-1][1], dp1[i-1][2]) + arr[0];
dp1[i][1] = Math.min(dp1[i-1][0], dp1[i-1][2]) + arr[1];
dp1[i][2] = Math.min(dp1[i-1][0], dp1[i-1][1]) + arr[2];
dp2[i][0] = Math.min(dp2[i-1][1], dp2[i-1][2]) + arr[0];
dp2[i][1] = Math.min(dp2[i-1][0], dp2[i-1][2]) + arr[1];
dp2[i][2] = Math.min(dp2[i-1][0], dp2[i-1][1]) + arr[2];
}
arr = getArr();
ArrayList<Integer> al = new ArrayList<>();
al.add(dp0[n - 1][0] + arr[1]);
al.add(dp0[n - 1][2] + arr[1]);
al.add(dp0[n - 1][0] + arr[2]);
al.add(dp0[n - 1][1] + arr[2]);
al.add(dp1[n - 1][1] + arr[0]);
al.add(dp1[n - 1][2] + arr[0]);
al.add(dp1[n - 1][0] + arr[2]);
al.add(dp1[n - 1][1] + arr[2]);
al.add(dp2[n - 1][1] + arr[0]);
al.add(dp2[n - 1][2] + arr[0]);
al.add(dp2[n - 1][0] + arr[1]);
al.add(dp2[n - 1][2] + arr[1]);
println(Collections.min(al));
}
static int toi(String s) { return Integer.parseInt(s); }
static long tol(String s) { return Long.parseLong(s); }
static String[] getLine() throws IOException { return br.readLine().split(" "); }
static int[] getArr() throws IOException { return Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); }
static <T> void print(T s) { System.out.print(s); }
static <T> void println(T s) { System.out.println(s); }
}